MR8740T_Quick guide_eng_20191016H.pdf - 第136页
130 Specications of the Options Model U8991 Digital V oltmeter Unit Conditions of guaranteed accuracy Specied under the following conditions: operated at 23°C±5°C (73°F±9°F) and 80% RH or less after a half-hour (at lea…
129
Specications of the Options
Frequency
characteristics
1 Hz to 50 kHz, −3 dB
Power supply for
detector
3.5 mA ±20%, 22 V ±5%
Input coupling AC/GND
Input terminals Metallic BNC terminal
-5. Specications for accuracy
Conditions of
guaranteed accuracy
Guaranteed accuracy period: 1 year
Guaranteed accuracy period after adjustment made by Hioki: 1 year
Temperature and humidity for guaranteed accuracy: 23°C ±5°C (73°F ±9°F), 80% RH or
less
Warm-up time: 30 minutes or more
Specied after execution of zero-adjustment
Accuracy of voltage
measurement
±0.5% f.s. (with the lter set at 5 Hz)
Temperature
characteristic
of voltage
measurement
±0.05% f.s./°C
Accuracy of
amplitude with
charge inputted
±2% f.s.
Temperature
characteristic with
charge inputted
±0.2% f.s./°C
Accuracy of
amplitude inputted
from acceleration
detector with built-in
pre-amplier
±2% f.s.
Temperature
characteristics
of input from
acceleration sensor
with the built-in pre-
amplier
±0.2% f.s./°C
Effect of radiated
radio-frequency
electromagnetic eld
±10% f.s. (max.) at 3 V/m (with the lter set at 5 Hz)
Effect of conducted
radio-frequency
electromagnetic eld
±10% f.s. (max.) at 3 V (with the lter set at 5 Hz)
3. Specications of functions
Low-pass lter Off, 5 ±50% (voltage input only), 500 ±50%, 5k ±50% (Hz); −3 dB
TEDS IEEE1451.1.4 Class 1 compliant
The instrument reads out sensor information to automatically congure the sensitivity
setting.
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Specications
130
Specications of the Options
Model U8991 Digital Voltmeter Unit
Conditions of
guaranteed accuracy
Specied under the following conditions: operated at 23°C±5°C (73°F±9°F) and 80% RH
or less after a half-hour (at least) warm-up (when installed in a Memory HiCorder)
Operating
environment
Indoors, Pollution Degree 2, Operating altitude: up to 2000 m (6562 ft.)
Operating
temperature and
humidity
Temperature: 0°C to 40°C (32°F to 104°F)
Humidity: 80% RH or less (no condensation)
Storage temperature
and humidity
Temperature: −10°C to 50°C (14°F to 122°F)
Humidity: 80% RH or less (no condensation)
Standards Safety: EN 61010
EMC: EN 61326 Class A
Dimensions Approx. 106W ×19.8H × 196.5D mm (4.17″W × 0.78″H × 7.74″D)
Mass Approx. 250 g (8.8 oz.)
Product warranty
period
3 years
Measurement item DC voltage
Measurement range
Measurement range Effective input
range*
Resolution Input resistance
1 V f.s. −1.2 V to 1.2 V 1 µV
100 M
Ω
or more
10 V f.s. −12 V to 12 V 10 µV
100 V f.s. −100 V to 100 V 100 µV 10 M
Ω
±1%
*: Guaranteed range of measurement accuracy
Maximum input
voltage
100 V DC
Maximum rated
voltage to earth
100 V AC, DC (between each input channel and enclosure, between any two of input
channels)
Without a measurement category rating, anticipated transient overvoltage: 500 V
Measurement
method
Delta-sigma modulation method
Measurement
terminal
Insulated BNC terminal
Number of channels 4 channels
Input type Unbalanced input (oating)
Integration time 20 ms × NPLC (power frequency: 50 Hz), 16.67 ms × NPLC (power frequency: 60 Hz)
(NPLC can be chosen from among 1, 10, and 100)
High-speed
response
The high-speed response can be switched between on and off.
Guaranteed accuracy
period
1 year
Guaranteed
accuracy period after
adjustment made by
Hioki
1 year
Measurement
accuracy
±0.02% rdg. ±0.0025% f.s.
Temperature
characteristics
(±0.002% rdg.±0.00025% f.s.)/°C
131
Specications of the Options
Effect of radiated
radio-frequency
electromagnetic eld
±0.1% f.s. (max.) at 3 V/m (in the 1 V f.s. range)
Effect of conducted
radio-frequency
electromagnetic eld
±0.1% f.s. (max.) at 3 V (in the 1 V f.s. range)
Common-mode
rejection ratio
100 dB or more (at 50 Hz / 60 Hz, a signal source resistance of 100
Ω
)
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Specications